JP3455727B2 - Antennas and wireless terminals using them - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna suitable for use in, for example, a mobile phone terminal, a PHS (Personal Handyphone System) terminal, and the like, and a wireless terminal using the antenna.

[0002]

2. Description of the Related Art Conventionally, in a wireless terminal, an antenna for receiving a high frequency signal from a base station and transmitting a high frequency signal to the base station can be generally extended or accommodated in the terminal body. Are configured in. Such an antenna employs an antenna structure for capturing a high frequency signal even when it is housed in the terminal body.

In this antenna structure, a helical first antenna portion having a first contact portion is arranged in a terminal body, and a second contact is longitudinally connected to the first antenna portion. The second antenna portion having the portion is arranged in the terminal body so that it can be extended and stored. When the second antenna part is housed in the terminal body, only the helical part of the first antenna is projected from the terminal body, and the first contact part is connected to the power supply part to supply power. When the second antenna part is extended from the terminal body, the second contact part is connected to the power supply part to supply power. As a result, it is possible to transmit and receive a high frequency signal to and from the base station in both usage modes of housing the antenna and extending the antenna.

As such an antenna, a monopole whose antenna element length is λ / 4, 3λ / 8, 5λ / 8 is used.

On the other hand, as an antenna satisfying the recent demands for wide band and high gain, its antenna element length is λ /
A so-called self-resonant type antenna having the number 2 has been proposed. This self-resonant antenna has a radiation directivity equivalent to that of a λ / 2 dipole antenna because the antenna element length is λ / 2, and is also omnidirectional and has a high gain characteristic. Therefore, the self-resonant antenna is
With a large LCD screen, the user can send and receive data such as character data, still image data, and moving image data while looking straight ahead, and can be applied to so-called viewer-type wireless terminals. .

Further, in the self-resonant type antenna,
At the time of power feeding, power is fed from the matching circuit end to the lower end of the antenna by using capacitive coupling, so that the Q value can be reduced, and thus it is possible to easily promote widening of the band. This self-resonant antenna is hereinafter referred to as a λ / 2 capacitive coupling type.

By the way, as a telescopic antenna, a bottom helical structure (a type in which the antenna is pulled up with the antenna left in the terminal body when housed when the antenna is extended) is conventionally known.

As a λ / 2 capacitive coupling type antenna having such a bottom helical structure, for example, as shown in FIG. 13, a radio unit 5b is accommodated in a terminal body 5a. An antenna cap 5c is erected on the terminal body 5a, and inside the antenna cap 5c,
The antenna element 5d, which constitutes the antenna when housed, is spirally arranged in the antenna axial direction. Then, in the antenna element 5d, a cylindrical frame 5f having a spiral matching circuit element 5e formed on its peripheral wall is internally mounted and coaxially assembled.

On the cylindrical frame 5f, an antenna 5g for extension is extended through the sleeve 5h in the directions of arrows A and B, and is attached to the housing itself. When the antenna 5g is extended from the terminal main body 5a, the antenna is extended. 5g is capacitively coupled to the matching circuit element 5e via the capacitive coupling portion 5i of the sleeve 5h. When the antenna 5g is housed in the terminal body 5a, the capacitive coupling with the capacitive coupling portion 5i is released, and only the antenna element 5d of the antenna at the time of storage is capacitively coupled to the matching circuit element 5e.

However, in the λ / 2 capacitive coupling type antenna, the antenna element 5d and the matching circuit element 5 are included.
Since e has to be assembled and arranged coaxially, there is a problem that its structure becomes very complicated.

[0011]

As described above, the conventional antenna has a problem that its structure is very complicated.

The present invention has been made in view of the above circumstances, and provides an antenna having a simple structure and capable of promoting a wide band and a high gain, and a wireless terminal using the antenna. The purpose is to

[0013]

According to the present invention, there is provided antenna supporting means for arranging a first antenna provided with a first antenna element in a terminal body so that the first antenna can be extended and stored therein, and is housed in the terminal body. A matching circuit for impedance matching with a radio section and a second antenna element forming a second antenna are formed, and a flexible substrate accommodated and arranged in the antenna supporting means so as to surround the first antenna. A second antenna element of the second antenna is capacitively coupled to the matching circuit, wherein the first antenna element is connected to the matching circuit in association with extension or storage of the first antenna. The antenna is provided with capacitive coupling means for capacitively coupling or decoupling.

According to the above configuration, the flexible substrate on which the matching circuit and the second antenna element of the second antenna are formed is extensible in the terminal body, and the first antenna is mounted on the antenna supporting means of the first antenna. Is arranged so as to surround the antenna axis of the first antenna, and the first antenna element of the first antenna is connected to the matching circuit of the flexible substrate in association with the extension of the first antenna from the terminal body or the accommodation of the first antenna in the terminal body. Is capacitively coupled or decoupled to control a desired antenna structure in cooperation with the second antenna element. Therefore, with a simple configuration in which the flexible substrate on which the second antenna element and the matching circuit are formed is mounted and arranged on the antenna support means of the first antenna, the wide band is promoted and the high gain is promoted. A telescopic antenna having a possible λ / 2 capacitive coupling type bottom helical structure can be configured.

Further, according to the present invention, there are provided an antenna supporting means for disposing the first antenna provided with the first antenna element in the terminal body so as to be extendable / storable, and a radio section accommodated in the terminal body. A flexible circuit in which a matching circuit for impedance matching and a second antenna element forming a second antenna are formed, and which is accommodated and arranged in the antenna supporting means so as to surround the periphery of the first antenna;
A second antenna element of the second antenna is capacitively coupled to the matching circuit, wherein the first antenna element is coupled to the matching circuit in association with extension or storage of the first antenna. The wireless terminal is configured to include capacitive coupling means for coupling or decoupling.

According to the above structure, the flexible substrate on which the matching circuit and the second antenna element of the second antenna are formed is extensible in the terminal body. Is arranged so as to surround the antenna axis of the first antenna, and the first antenna element of the first antenna is connected to the matching circuit of the flexible substrate in association with the extension of the first antenna from the terminal body or the housing of the first antenna. Is capacitively coupled or decoupled to control a desired antenna structure in cooperation with the second antenna element. Therefore, the flexible substrate on which the second antenna element and the matching circuit are formed is
A telescopic antenna of a λ / 2 capacitive coupling type bottom helical structure capable of facilitating a wide band and a high gain with a simple configuration only by assembling the antenna supporting means of the first antenna. It can be configured, and a so-called viewer-type terminal configuration can be realized.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will now be described in detail with reference to the drawings.

1 and 2 show an antenna and a wireless terminal using the antenna according to an embodiment of the present invention. FIG. 1 shows an antenna housed state, and FIG. 2 shows an antenna extended state. Show.

That is, the printed wiring board 9 is provided on the terminal body 10.
Are accommodated and arranged. Then, on the printed wiring board 9, a radio unit 1, a baseband unit 2, an input / output unit 3 and the like are formed as shown in FIG. 3, for example.

In the figure, a radio frequency signal arriving from a base station (not shown) via a radio channel is received by a telescopic antenna 11 which is a feature of the present invention and will be described in detail later, and then an antenna duplexer (DUP). It is input to the receiving circuit (RX) 13 via 12. The receiving circuit 13 includes a high frequency amplifier, a frequency converter and a demodulator. And
The radio signal is low-noise amplified by a low-noise amplifier, and then a frequency synthesizer (SYN) 14 is used in a frequency converter.
The frequency is converted into a reception intermediate frequency signal or a reception baseband signal by mixing with the reception local oscillation signal generated from the signal, and the output signal is digitally demodulated by a demodulator. As the demodulation method, for example, an orthogonal demodulation method corresponding to the QPSK method and a spectrum despreading method using a spread code are used. The frequency of the received local oscillation signal generated by the frequency synthesizer 14 is the baseband unit 2.
It is instructed from the main control unit 21 provided in the.

The demodulated signal output from the demodulator is input to the baseband unit 2. The baseband unit 2 includes a main control unit 21, a demultiplexing unit 22, a voice code decoding unit (hereinafter referred to as a voice codec) 23, a multimedia processing unit 24, an LCD control unit 25, and a memory unit 26. Is equipped with.

The demodulated signal is discriminated by the main control section 21 as control information or multimedia information, and if it is multimedia information, it is supplied to the demultiplexing section 22 where audio data and image data are transmitted. Is separated into
Then, the audio data is supplied to the audio codec 23 and decoded there, whereby the reproduced audio signal is output from the speaker 32 of the input / output unit 3 in a loud voice. On the other hand, the image data is supplied to the multimedia processing unit 24 where it is subjected to image decoding processing, and the image signal reproduced thereby is input / output unit 3 via the LCD control unit 25.
It is supplied and displayed on the LCD 34 of.

The received image data is stored in the RAM in the main controller 21 as needed. Also LCD3
Reference numeral 4 indicates various information output from the main controller 21 indicating the operating state of the device itself, such as a telephone directory or a received electric field strength detection value,
The remaining battery level is also displayed.

On the other hand, the transmitted voice signal of the user output from the microphone 31 of the input / output unit 3 is the baseband unit 2
Audio codec 23, the audio coded here, and then input to the demultiplexing unit 22. In addition, the camera (C
The image signal output from the (AM) 33 is input to the multimedia processing unit 24 of the baseband unit 2, where it is subjected to image coding processing and then input to the demultiplexing unit 22. In the demultiplexing unit 22, the encoded audio data and image data are multiplexed in a predetermined format,
The multiplexed transmission data is input from the main control unit 21 to the transmission circuit (TX) 15 of the wireless unit 1.

The transmission circuit 15 comprises a modulator, a frequency converter and a transmission power amplifier. The transmission data is digitally modulated by a modulator and then mixed by a frequency converter with a transmission local oscillation signal generated from the frequency synthesizer 14 to be frequency-converted into a radio frequency signal. As a modulation method, a QPSK method and a spread spectrum method using a spread code are used. Then, the generated transmission radio frequency signal is amplified to a predetermined transmission level by the transmission power amplifier, and then supplied to the antenna 11 through the antenna duplexer 12 and directed from the antenna 11 to a base station (not shown). Sent.

Further, the input / output unit 3 is provided with an illuminator 36 for illuminating the LCD 34 and the key input unit 35 during operation and communication. The illuminator 36 is called, for example, a backlight or an illumination.

The telescopic antenna 11 for transmitting and receiving signals to and from the base station described above will now be described.

That is, the terminal body 10 has a cylindrical antenna cap 1 made of a non-metallic material which constitutes an antenna supporting means.
10 is projected and assembled. A cylindrical frame 111 made of a non-metal material is incorporated in the antenna cap 110 (see FIG. 4). An elastic locking portion 112 is formed on the frame 111, for example, and the elastic locking portion 112 is locked to a part of the terminal body 10 by using its elastic force and is assembled to the terminal body 10.

The frame 111 has slots 11
3 is formed, and a cylindrical sleeve 1 made of a metallic material is formed therein.
14 is inserted. The sleeve 114 has a brim-shaped connecting portion 115 at the base thereof in the slot 11 of the frame 111.
3 corresponding to No. 3, and the power feeding pin coupling portion 1 at the tip thereof.
16 is formed. One end of the power supply pin 117 is coupled to the power supply pin coupling section 116, and the other end of the power supply pin 117 is electrically connected to the DUP 12 of the wireless section 1 of the printed wiring board 9.

A flexible substrate 118 is wound around the frame 111 by utilizing its bending. This flexible substrate 118 has a second
The antenna element 119 and the matching circuit 120 for impedance matching which form the antenna of (1) are formed in a meandering pattern, for example, and are wound and arranged between the frame 111 and the antenna cap 110. This matching circuit 1
The power supply terminal 121 of 20 is electrically connected to the connection portion 116 of the sleeve 114 through the slot 113 of the frame 111.
DUP of the wireless unit 1 of the printed wiring board 9 via 17
12 is electrically connected.

Here, the antenna element 119 is formed on the flexible substrate 118 so as to have a length of, for example, λ / 2 wavelength, and the length of the matching circuit 120 is, for example, the length of a feeding pin 117 which will be described later. Are formed so that the sum of the wavelengths and the wavelengths is λ / 4 wavelength.

A rod-shaped antenna 122 constituting the first antenna is installed in the sleeve 114 so that it can be extended and stored in the directions of arrows A and B. The rod-shaped antenna 122 is provided with a linear antenna element 123 having, for example, λ / 2 wavelength, substantially coaxially with the antenna element 119 of the flexible substrate 118. This antenna element 1
In the extended state of the antenna 11, a base end 23 of the antenna 23 is electrically coupled to the capacitive coupling portion 124 of the flexible substrate 118 and electrically connected to the matching circuit 120.
A first stopper 125 for regulating the storage position is formed at one end of the rod antenna 122 so as to correspond to the end of the antenna cap 110, and a second stopper 126 for regulating the extension is formed at the other end. It is formed corresponding to the end of the frame 111.

In the above structure, the rod-shaped antenna 122
When is urged to move in the direction of arrow B, the first stopper 125 is brought into contact with the tip of the antenna cap 110, and the storage in the terminal body 10 is completed.

Here, the end of the antenna element 123 of the rod-shaped antenna 122 on the upper end side is the flexible substrate 11.
8 is separated from the capacitive coupling portion 124 of the matching circuit 120 of 8 and the electrical connection is released. At this time, the flexible substrate 1
The antenna element 119 of 18 is electrically connected to the matching circuit 120 via the capacitive coupling section 124, so that the antenna section 119 of the wireless section 1 of the printed wiring board 9 is connected via the matching circuit 120, the sleeve 114, and the power feeding pin 117. It is electrically connected to the DUP 12 to perform transmission / reception of signals by so-called λ / 2 capacitive coupling when the antenna is housed.

When the rod-shaped antenna 122 is moved and urged in the direction of arrow A in the housed state, the rod-shaped antenna 122 starts to be extended, and the second stopper 126 is moved to the frame 1.
The extension operation is completed in the state of being in contact with the end portion of 11.

Here, the end of the antenna element 123 of the rod-shaped antenna 122 on the lower end side is the flexible substrate 11.
8 is electrically connected to the capacitive coupling portion 124 of the matching circuit 120, the matching circuit 120, the sleeve 114, and the feeding pin 1
It is electrically connected to the DUP 12 of the wireless unit 1 of the printed wiring board 9 via 17, and a signal transmission / reception is performed by so-called λ / 2 capacitive coupling when the antenna is extended.

When the rod-shaped antenna 122 is extended, the antenna element 119 of the flexible substrate 118 is electrically connected to the matching circuit 120 via the capacitive coupling section 124. However, since the coupling capacitance is small, the rod-shaped antenna 122 is Signal transmission / reception is performed by the antenna element 123 of 122.

As described above, in the antenna, the flexible substrate 118 on which the antenna element 119 and the matching circuit 120 are formed is wound in the antenna cap 110, assembled and arranged in the terminal body 10, and the flexible substrate 11 is arranged.
Extend the rod-shaped antenna 122, which is arranged so that it can be extended,
Assembled so that it can be stored freely.
23 is capacitively coupled or uncoupled to the matching circuit 120 of the flexible substrate 118,
In cooperation with the antenna element 119 of the above, the telescopic antenna structure is controlled.

According to this, the flexible substrate 118 on which the antenna element 119 and the matching circuit 120 are formed is wound around the terminal body 10 with the antenna cap 110 interposed therebetween, and the rod-shaped antenna 122 is wound around. A telescopic antenna with a λ / 2 capacitive coupling type bottom helical structure that can realize a wide band and a high gain can be configured with a simple structure that can be extended and stored in the substrate 118 so as to be assembled and arranged. can do.

Further, the above-mentioned wireless terminal has the antenna element 11
9 and the flexible substrate 11 on which the matching circuit 120 is formed
8 is wound inside the antenna cap 110 and the terminal body 1
0, and the rod-shaped antenna 122, which is arranged so as to be able to extend in the flexible substrate 118, is assembled so that it can be extended and stored, and the antenna element 123 of the rod-shaped antenna 122 is linked with the extension or storage of the rod-shaped antenna 122. But,
It is configured such that the telescopic antenna structure is assembled and arranged in the terminal body 10 in cooperation with the antenna element 119 of the flexible substrate 118 after being capacitively coupled or decoupled from the matching circuit 120 of the flexible substrate 118.

According to this, the flexible substrate 118 on which the antenna element 119 and the matching circuit 120 are formed is wound around the terminal body 10 via the antenna cap 110, and the rod-shaped antenna 122 is wound around. The λ / 2 capacitive coupling type retractable antenna with a bottom helical structure is provided, which can be easily assembled and arranged so that it can be extended and stored in the substrate 118, and can realize wide band and high gain. To be As a result, it is possible to easily realize a so-called viewer type terminal configuration for transmitting and receiving data such as still image data and moving image data.

The present invention is not limited to the above-described embodiment, but as other embodiments, the embodiment shown in FIGS. 5 and 6, the embodiment shown in FIGS. 7 to 9, and the embodiment shown in FIG.
0 and the embodiment shown in FIG. 11 and the embodiment shown in FIG. However, these FIG. 5 and FIG.
7 to 9, FIG. 10, FIG. 11 and FIG.
The same parts as those in FIGS. 1 to 4 are designated by the same reference numerals, and detailed description thereof will be omitted.

That is, in FIG. 5 and FIG. 6, a linear antenna element 123 is provided for the rod-shaped antenna 122, and
Is formed up to the vicinity of the stopper 126, and the antenna element 123 is capacitively coupled to the matching circuit 120 together with the antenna element 119 of the flexible substrate 118 in both the extended state and the stored state of the rod-shaped antenna. It was done. In this case, the capacitive coupling of the antenna element 123 with the matching circuit 120 causes the matching circuit 120 of the antenna element 119 of the flexible substrate 118.
It is set to have the same capacity as the capacity coupling with.

According to this, the antenna element 123 of the rod-shaped antenna 122 is extended and retracted in both directions.
Further, the resonance of the antenna element 119 of the flexible substrate 118 appears, so that a wider band can be promoted.

Further, in this antenna structure, the antenna element 123 and the antenna element 119 together with the antenna element 119 with respect to the matching circuit 120 of the flexible substrate 118 are capacitance only when the rod-shaped antenna 122 is in the extended or stored state. It may be configured to be combined.

Further, in FIGS. 7 to 9, the antenna element 119 and the matching circuit 120 are provided on the flexible substrate 12 wound inside the antenna cap 110.
It is formed so as to face the handset 127 provided in the terminal body 10 with the antenna axis interposed therebetween in the assembled state to the frame 111.

According to this, after satisfying the downsizing of the terminal body 10, when the rod-shaped antenna 122 is stored,
It is possible to maximize the distance L between the antenna element 119 and the matching circuit 120 of the flexible substrate 118 and the user who uses the handset 127 to make a call. That is, as shown in FIG. 9, it is possible to improve the radiation efficiency of the antenna element 119 of the flexible substrate 118, which is determined by the distance L to the user when the terminal is in use. Therefore, it is possible to easily improve the radiation efficiency by satisfying the downsizing of the terminal body 10 and by making the distance L large.

Further, in FIGS. 10 and 11, the flexible substrate 11 wound inside the antenna cap 110 is used.
8, the antenna element 119 and the matching circuit 12
No. 0 is formed so as to be inclined by about 45 degrees or more with respect to the antenna axis in the assembled state to the frame 111.

According to this, since the antenna element 119 and the matching circuit 120 are tilted by about 45 degrees or more with respect to the antenna axis, the antenna element 119 automatically moves in the talking state of the user. , The vertically polarized wave transmitted from the base station is received with high efficiency, or is directed in the direction of the main polarized wave (zenith) that enables highly efficient transmission to the base station (see FIG. 11). Therefore, a highly efficient call using the antenna element 119 can be realized while realizing a simple use.

Further, in FIG. 12, only the antenna element 119 is formed on the flexible substrate 118, and the antenna element 119 is directly capacitively coupled to the sleeve 114. Then, one end of a power supply pin 117 connected to the wireless unit 1 is electrically connected to the sleeve 114, and the power supply pin 117 is used as a matching circuit.

According to this, since only the antenna element 119 needs to be formed on the flexible substrate 118, the structure of the flexible substrate 118 can be simplified.

Further, in the above embodiment, the case where the antenna element 119 and the matching circuit 120 formed on the flexible substrate 118 are formed in a meandering pattern has been described, but the present invention is not limited to this. It is possible to configure by using the pattern structure of.

Further, in the above-mentioned embodiment, the case of applying the telescopic antenna having the bottom helical structure has been described.
The present invention is not limited to this, and is also applicable to a top helical structure having a configuration in which the antenna used for housing is extended when the antenna is extended, and substantially the same effect can be expected.

Therefore, the present invention is not limited to the above-described embodiment, and in addition, various modifications can be made at the stage of carrying out the invention without departing from the scope of the invention. Further, the embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements.

For example, even if some constituent elements are deleted from all the constituent elements shown in the embodiment, the problem described in the section of the problem to be solved by the invention can be solved, and the effect described in the effect of the invention can be obtained. When the above is obtained, the configuration in which this constituent element is deleted can be extracted as the invention.

[0056]

As described in detail above, according to the present invention, an antenna and a wireless terminal using the same are provided which are simple in structure and can promote wide band and high gain. can do.

[Brief description of drawings]

FIG. 1 is a sectional view showing an antenna according to an embodiment of the present invention and a main part of a wireless terminal using the antenna.

FIG. 2 is a sectional view showing an extended state of the rod-shaped antenna of FIG.

FIG. 3 is a block diagram showing a circuit configuration configured on the printed wiring board of FIG.

FIG. 4 is an exploded perspective view showing an essential part of the antenna of FIG. 1 in an exploded manner.

FIG. 5 is a cross-sectional view shown for explaining another embodiment of the present invention.

6 is a cross-sectional view showing a housed state of the rod-shaped antenna of FIG.

FIG. 7 is an exploded perspective view shown for explaining another embodiment of the present invention.

FIG. 8 is a sectional view showing a housed state of the rod-shaped antenna of FIG.

FIG. 9 is a characteristic diagram shown for explaining the effect of FIG.

FIG. 10 is an exploded perspective view shown for explaining another embodiment of the present invention.

FIG. 11 is a schematic diagram shown for explaining the effect of FIG.

FIG. 12 is a sectional view shown for explaining another embodiment of the present invention.

FIG. 13 is a cross-sectional view showing a configuration of a conventional bottom helical structure antenna.

[Explanation of symbols]

9 ... Printed wiring board. 10 ... Terminal body. 1 ... Radio section. 11 ... Antenna. 110 ... Antenna cap. 111 ... Frame. 112 ... Elastic locking portion. 113 ... Slot. 114 ... Sleeve. 115 ... Connection part. 116 ... Power supply pin coupling part. 117 ... Power supply pin. 118 ... Flexible substrate. 119 ... Antenna element. 120 ... Matching circuit. 121 ... Power supply terminal. 122 ... A rod-shaped antenna. 123 ... Antenna element. 124 ... Capacitive coupling section. 125 ... First stopper. 126 ... Second stopper. 127 ... Handset. 12 ... Antenna duplexer. 13 ... Receiving circuit. 14 ... Frequency synthesizer. 15 ... Transmission circuit. 2 ... Baseband part. 21 ... Main control unit. 22 ... Demultiplexing unit. 23 ... Speech code decoding unit. 24 ... Multimedia processing unit. 25 ... LCD control unit. 26 ... Memory part. 3 ... Input / output section. 31 ... Microphone. 32 ... Speaker. 33 ... Camera. 34 ... LCD. 35 ... Key input section. 36 ... Illuminator.

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiromichi Suzuki, 1-chome, 3-chome, Asahigaoka, Hino-shi, Tokyo (1) Inside the Toshiba Hino Plant (56) References JP 10-303622 (JP, A) JP HEI 11-317608 (JP, A) JP-A-11-177331 (JP, A) JP-A-10-79614 (JP, A) JP-A-5-243834 (JP, A) JP-A-5-347507 (JP, A) A) JP-A-10-276029 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01Q 1/24 H01Q 1/38 H01Q 9/32 H01Q 21/28

Claims (10)

(57) [Claims] 1. An impedance matching is performed between an antenna supporting means for arranging a first antenna provided with a first antenna element in a terminal main body so as to be extendable / storable, and a radio unit accommodated in the terminal main body. A flexible circuit board, in which a matching circuit and a second antenna element constituting a second antenna are formed, and which is accommodated and arranged in the antenna supporting means so as to surround the periphery of the first antenna, and a second substrate of the second antenna Capacitive coupling of the second antenna element to the matching circuit, the capacitive coupling coupling or decoupling the first antenna element to the matching circuit in association with extension or storage of the first antenna. An antenna comprising: 2. The capacitive coupling means, when the first antenna is in an extended state, capacitively couples the first antenna element of the first antenna to the matching circuit together with the second antenna element of the second antenna. The antenna according to claim 1, wherein the antenna is coupled. 3. The capacitive coupling means, when the first antenna is housed, places the first antenna element of the first antenna in the matching circuit together with the second antenna element of the second antenna. The antenna according to claim 1, wherein the antenna is coupled. 4. The second antenna element of the second antenna is arranged at a position opposed to a receiver arranged in the terminal body with an antenna axis interposed therebetween. 3. The antenna according to any one of 3 above. 5. The second antenna element of the second antenna is provided such that the direction of main polarization is inclined by approximately 45 degrees or more with respect to the antenna axis. antenna. 6. Impedance matching is performed between an antenna support means for arranging a first antenna provided with a first antenna element in a terminal main body so as to be extendable and storable, and a radio unit accommodated in the terminal main body. A flexible circuit board, in which a matching circuit and a second antenna element constituting a second antenna are formed, and which is accommodated and arranged in the antenna supporting means so as to surround the periphery of the first antenna, and a second substrate of the second antenna Capacitive coupling of the second antenna element to the matching circuit, the capacitive coupling coupling or decoupling the first antenna element to the matching circuit in association with extension or storage of the first antenna. And a wireless terminal. 7. The capacitive coupling means causes the first antenna element of the first antenna to be coupled to the matching circuit together with the second antenna element of the second antenna when the first antenna is in an extended state. The wireless terminal according to claim 6, wherein the wireless terminal is coupled. 8. The capacitive coupling means causes the first antenna element of the first antenna to function in the matching circuit together with the second antenna element of the second antenna when the first antenna is in an extended state. The wireless terminal according to claim 6, wherein the wireless terminal is coupled. 9. The second antenna element of the second antenna is arranged at a position opposed to a handset arranged in the terminal body with an antenna axis interposed therebetween. 8. The wireless terminal according to any one of 8. 10. The second antenna element of the second antenna is provided such that the direction of main polarization is inclined by about 45 degrees or more from the antenna axis. Wireless terminal.